Dishwashing machine



A. J. MITCHELL DISHWASI IING MACHINE 1922 2 Sheets-Sheet 1 Filed March 23 llmmn'rom R.J.

July 29, l 924.

1,503,427 A. J. MITCHELL.

DISHWASHING MACHINE 2 Sheets-Sheet 2 Filed March 23 1922 AJ. Mitchell Patented July 29,. 1924.

ALFRED J. MITCHELL, OF ,ST. BONIFACE, MANITOBA, CANADA.

nrsnwasnme 'mcnma.

Application filed March 23, 1922. Serial No. 548,080.

To all whom it may concern:

Be it known that I, ALIE'RED J. Mrronrmn, of the city of St. Boniface, in the Province of Manitoba, Canada, have invented certain new and useful Improvements'in Dishwashing Machines, of which the following is the specification.

The invention relates to improvements in dish washing machines and an object of the invention is to provide a simply constructed, easily operated machine, into which the dishes to be washed can be easily and quickly placed and subsequently effectively washed in the operation of the machine.

A further important object of the invention'is to provide a 'machine having a large washing capacity whilst using a comparatively small quantity of water.

A still further object of the invention is to construct a machine in which the water is thrown in an upward direction and in the form of a heavy spray against the dishes and is subsequently deflected downwardly to again contact with the dishes, such movement of the water effectively washing both sides of the dishes placed in the machine.

A further object of the invention is to provide a machine in which the dishes can be dried without having to remove the same.

A still further object is to provide con-' venient removable racks for holding the various kinds of dishes.

A still further object is to provide means for arresting any heavy material which nay be'in the water and preventing the same from being carried up in the spray.

With the above more important objects in view the invention consists essentially in the arrangement and construction of parts hereinafter more particularly described and later pointed out in the appended claim, reference being had to the accompanying drawings in which;

f Fig. 1 is a front view of the machine. c Fig. 2 is a sideview thereof.

Fig. 3 is an enlarged detailed vertical sectional view centrally through the tank, certain of the driving parts bemg shown in side. elevation.

Fig. 4 is a horizontal sectional view through the tank, the section being taken at. 44 Figure 3. I

Fig. 5. is a horizontal sectional view at 5 5 Figure 3.

Fig. 6 is an enlarged detailed vertical sectional view at 6-6' Fig. 2..

Figures 7 and 8 are perspective views of the two dish racks employed.

In the drawings like characters of reference indicate corresponding partsin the several figures. Y

The dish washing 'tank 10f themachine is cylindrical and is provided with a conical bottom 2 forming a well, and towards the top of the tank I locate an internal ledge 3 for the removable tank top or cover 4 which is provided with suitable hand grips 5 and 6. The coverv4 is cone shaped, being opposed to the well; the reason for this will be later explained.

The tank is supported by four legs 7, whieh in. the present instance are formed from two metallic bars which have the body portions thereof intersecting at right angles centrally beneath the tank and the end portions thereof extending upwardly and permanently riveted or otherwise fastened to the sides of'the tank. T

Upper and lower reinforcing-bands 8 and 9 pass around the tank body and suitablev casters 10 are attached to the legforming bars, the casters allowing of the convenient shifting of the machine from place to place. Centrallyof the bottom of the tank I provide a water tight bearin 11 which receives rotatably the propel er or. dasher shaft 12, the lower end of which is suitably carried in a bearin 13 :mounted on the crossed portions of t e leg bars. Ball bearings (not shown) are in the bearings to insure of free. and easy running of the shaft. To theup-per end of the shaft I attach a two bladed propeller or clasher 14 which is contained within the well.

An electric motor 15 is suitably mounted beneath the tank and the motor shaft 16 is provided with a driving pulley 17.

A combination belt tightener and guide 18 is carried by one of the legs, the belt tightener comprising a stirrup 19 slidably attached to the leg by a strap 20 and being held adjustably in position by a jam bolt 21 passing through the leg and fitted with a wing nut 22. Both the stirrup and the strap are slotted to rewive the bolt and allow of the up and down movement of the stirrup and the stirru is held in place by the strap 20 being ammed between the vanes is shown best in Figure 4. Inclined ing up of the wing nut. The stirrup carries a air of flanged pulleys 24 and 25 and an endless belt 26 passes around the motor pulley 17 upwardly over the pulleys 24 and 25 and then overto and around a pulley 27 secured to the shaft 12.

The bottom of the tank carries a plurality of vertically disposed bowed or arched vanes or deflectors 28 which have their outer ends extending to the wall of the tank and their inner ends terminating just nicely clear of' the dasher. The position of the screens 29 are secured to the upper edges of the'vanes and connect with the wall of the tank.

Trays 30 and 31 are provided for insertion within the tank and the trays are formed preferably from wire and are provided with pockets and hooks for receiving and carrying the dishes. The tray 30 is utilized for washing a considerable quantity of dishes as it has upper and lower decks; whilst the tray 31 is utilized where there is only a small quantity of dishes, such as cups, saucers and tea plates.

I find it desirable to have a screen, indicated at 32, on the bottom of the trays to break up the water sprayed onto the dishes.

Where a two deck tray is used it is only necessary. to' have a small screen centrally at the. bottom of the lower deck as the dishes themselves serve to break up and disintegrate the spray.

In the single deck tray it is desirable to make the screen full size as in a tray of this kind one usually washes finer dishes which are com aratively light, and it is not desirable to ave a heavy spray strike them.

The trays are supplied with outstanding lugs 33 adapted to be supported by suitable carriers 34 piermanently fastened to the inner side of t e tank.

When it is desired to use the machine the dishes are nested on one or other of the trays and the tray is then placed within the tank, being supported by the carriers 34. The motor is then operated and it drives the propeller or dasher in the direction indicated by the applied arrow Figure 4 and forces the hot water, previously placed in the well, upwardly in the form of a spray on the dishes.

I wish now to give a more detailed description of the action of the propeller and vanes, and in this connection I think it desirable to point out that the machine uses,

comparatively speaking, a very smallquantity of water. To give a better idea of this might mention that in a machine having a diameter of approximately twentyinches I only use approximately three quarts of water, such amount of water just filling the cone shaped well.

When the machine is operated there is a to speak, in -about moans? though the same operation. The action is V as follows The paddles throw the water in the well by centrifugal force outwardly to the Wall of the well and the water so thrown out swirls around and is deflected by a vane. The water so thrown out by one of the propeller blades and deflected by a vane is caught b thefollowing propeller blade just as it is eavin the inner end of the vane, and here it wi 1 be observed that the direction of motion of the water and the said blade are more or less opposed. The result of this is that through impactthe water is shot angularly upwardly Within the tank in the form of a spray having a considerable velocity and this contacts with the dishes. Passing through the dishes its strikes the cone shaped top 4 and is deflected upwardly and inwardly to the peak of the cone where it drops down and again strikes the dishes prior to passing tothe well.

By this action I wash both sides of the dishes nested on the tray as the up going water catches one side and thedown coming water the other side.

I find by actual demonstration that the water passes through a complete cycle, so one second and by this I mean, that all the water in the well is thrown out of the well, passes up to the top of the cone and drops down again in about one seconds time. This action is the pulsating action I have hereinbefore mentioned.

By so completely utilizing all the water and keeping it suspended in this pulsating way I require to use, relatively speaking, only a small quantity of water in a machine having a comparatively large capacity.

The bottom of the machine is fitted with a drain cock 35 so that after the dishes have been washed the water can be drained out.

If very hot water is used one can dry the dishes immediately after draining out the water as by removlng the cover one can start the motor and operate the fan, which then acts to create a drying air draft upwardly through the dishes suspended in the rack.

The screens 29 associated with the vanes or defiectors serve to gather any foreign material in the water, such asa small piece of meat, potato, or such like. Inthe operation of the machine such foreign material will jump over the top of the vane and lodge on the screen and will not be carried up with the water.

What I claim as my invention is:

In a-dish washing machine, tank having the lower end thereof forming spray passes through and' a cylindrical a water well, a propeller rotatably mounted in the well, means for rotating the propeller at a comparatively'high speed to cause the wate'r in the wall to be thrown outwardly by the respective propeller blades against the wall of the tank and means for deflecting the water so thrown against the wall of the tank inwardly and in a direction such that it will be opposed to the direction of r0- tation of the blades and will be struck by the 10 blades and deflected upwardly in a spray. Signed at Winnipeg this 19th day of January 1922.

ALFRED J .-MITCHELL. In the presence of:-

eGARALD S. ROXBURGH,

M. B. KELLEHER. 

